Electrical transformer



Sept. 29, 1942. L. LORANT ELECTRICAL TRANSFORMER Filed Oct. 15, 1940 INVENTOR L [one] [orwzf Pstented Sept. 29, 1942 ELECTRICAL TRANSFORMER.

Lionel Lorant, Sunnyslde, N. Y., assignor to Super Electric Products Corp., Jersey City, N. 1., a corporation of New Jersey Application October 15, 1940, Serial No. 361,202

2 Claims.

My present invention relates to electrical transformers.

It is found that reception by radio receiving apparatus is materially interfered with by the creation of noises due to electrical disturbances set up in current feed lines caused by the operation of electrical step-up transformers of neon sign and oil burner installations; said transformers receiving their primary current supply from said feed lines.

It is therefore the principal object of this invention, to provide an electrical transformer of novel and improved construction, the operation of which causes no such disturbances as above mentioned, that is, the operation of the transformer in no manner afiects or disturbs the operation of the radio receivers.

I have ascertained that the real offending parts of the secondary system which cause electrical disturbances in the primary system of the transformer, meaning the disturbances desired to be avoided, are the internal leads to the secondary terminals together with the extensions of said leads on the secondary coil or coils up to the region of the core. It is the electrical emanations from these two short lengths of wire which aifect the primary circuit, causing the trouble aforesaid.

I therefore resort to shielding therespective circuits of the transformer from each other in a novel, improved, simple, cheap and efficient manner, and what I do essentially to accomplish this, is shield only those portions of the components of the primary circuit which extend beyond that side of the core of the transformer, beyond which side said short lengths of secondary wire extend, employing the core proper as part of the shielding means, and thus effecting a substantial saving in the cost of construction and the labor involved in assembly. This, of course, is only one embodiment following the teachings of this invention.

I am aware that this invention is capable of numerous forms and various applications without departing from the essential features herein disclosed. It is therefore intended and desired that the specific constructions herein be deemed illustrative and not restrictive, and that the patent shall cover all patentable novelty herein taught; reference being had to the appended claims rather than to the particular description herein to indicate the scope of this invention.

In the accompanying drawing forming part ence indicate corresponding parts in all the views.

Fig. 1 is a perspective view of an encased transformer, embodying the teachings of this invention.

Fig. 2 is a section taken along lines 2-2 in Fig. 1.

Fig. 3 is a perspective view of the transformer included in Fig. 1.

Fig. 4 is a view similar to Fig. 1, of a slightly modified structure.

Fig. 5 is a section taken along lines 5-5 in Fig. 4.

Fig. 6 shows a perspective of the transformer included in Fig. 4.

Fig. 7 shows another modification in transformer design in accordance with this invention.

In the drawing the numeral l5 indicates generally a shell type transformer, comprising a laminated core IS, on which is mounted a primary coil I1, and the secondary coils I8 and I9. This structure I5, is housed within the metal casing 20, which is of such dimensions that the core l6 acts as a partition forming the compartments 2| and 22; that is, said core is in substantial abutment with the side walls of the easing 20. It is evident that parts of both the primary and secondary coils reside in each of said casing compartments. It is preferred, but not mandatory, that the last portions of the last turns l8 and I9 of the secondary coils l8 and I9, and the internal secondary leads l8" and I9" shall be in one of the compartments, while the internal primary leads ll shall be in the other compartment.

of this application, similar characters of refer- In this construction, only that portion of the primary coil I! which is in the same compartment with the elements I8, l8", I9 and I9", is covered with a metallic member or shield 23; the core l6, acting as a shield for those portions of the components of the primary circuit which are within the compartment 22.

In the embodiment shown in Fig. 5, where one dimension of the core I6, i less than the analogous dimension of the casing IS, a metallic plate 24 extending from said core, serves to complete the partitioning of said casing to form the compartments 2| and 22'. Desiring to form a chamber 25, wherein the primary leads ll may be connected to the current feed lines, I partition the chamber 2 I with a metallic member 26, which thus acts as a shield against the offending elements II, l8", l9 and I!" of the secondary circuit, for the primary leads I1 and the primary cable connection which could be elected oi the knock-out plugs 21. The primary current ieedline cable is not shown. The removeable plate it, serves to cover the opening in the casing il', through which the making or such connection is i'acilitated. The numeral 2|, designates insulators tor the primary lead wires iI'. which wires. in good results may lie alone the core II. The secondary terminals are indicated by the numeral when the transformer is not 0! the shell type, as for instance shown in Fig. 'l, the compartments orsectionsinthecasingthareiormedbya metallic extension 82, which forms with the core a, the required partition.

It is to be noted that the core'or its extensions forming the casing partition need not be in abutment with the walls 0! the casing. although desirable and expedient, abutment is not essential ior proper operation.

Having set forth various. embodiments oi this invention, and desiring that the Letters, Patent shall cover its teachings. as and for my invention,

I claim:

1. Inadevice of the character described,a transformer comprising a core having primary and unshielded secondary coils thereon, a metallic casing housing the transformer. metallic elements extending from the core portion carrying the coils. towards the walls oi the casing. whereby the casing is substantially divided by the core into two compartments, a metallic member extending from the core and substantially partitioning one of said compartments into two chambers: said metallic member being positioned beyond the secondary coil portion remotest from the primary coil: P rts of all the. coils residing in the undivided compartment, and only in one oi the chambers oi the other compartment; the secondary. internal terminal leans lying wholly within said means covers only that part oi the primary cellwhich lies in the iirst chamber.

LIONEL LORANT. 

